Income Taxes (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Contingency [Line Items]
Foreign withholding tax imposed on domestic income included in federal current taxes	$ 3,200,000	$ 2,300,000	$ 0
Effective income tax rate reconciliation, at federal statutory income tax rate (percentage)	35.00%	35.00%	35.00%
Cumulative undistributed earnings of foreign subsidiaries	19,800,000
Unrecognized tax benefits that would Impact effective tax rate	7,300,000
Unrecognized tax benefits that would impact effective tax rate, current	200,000
Unrecognized tax benefits, reductions resulting from lapse of applicable statute of limitations	4,478,000
Unrecognized tax benefits, decreases resulting from settlements with taxing authorities	1,616,000
Interest and penalties accruals (benefits) related to uncertain tax positions, included in Income tax expense	100,000	(1,700,000)	(100,000)
Liability for uncertain tax positons, interest and penalties, noncurrent	3,100,000	2,700,000	2,600,000
Income tax reconciliation, tax holidays	300,000	1,100,000	900,000
Equity impact upon recognition of equity compensation of deferred tax assets not reported on balance sheet	17,600,000
Internal Revenue Service (IRS) [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards	678,000,000
Internal Revenue Service (IRS) [Member] | Research [Member]
Income Tax Contingency [Line Items]
Tax credit carryforward, amount	5,900,000
State and Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards	431,300,000
Operating loss carryforwards, valuation allowance	194,200,000
State and Local Jurisdiction [Member] | Maximum [Member]
Income Tax Contingency [Line Items]
Potential tax benefit on reversal of net operating loss carryforwards valuation allowance	8,800,000
State and Local Jurisdiction [Member] | Research [Member]
Income Tax Contingency [Line Items]
Tax credit carryforward, amount	8,900,000
Tax credit carryforward, valuation allowance	8,900,000
State and Local Jurisdiction [Member] | Research [Member] | Maximum [Member]
Income Tax Contingency [Line Items]
Potential tax benefit on reversal of tax credit carryforward valuation allowance	5,800,000
Foreign Country [Member]
Income Tax Contingency [Line Items]
Operating loss carryforwards	13,900,000
Operating loss carryforwards, valuation allowance	3,500,000
Foreign Country [Member] | Maximum [Member]
Income Tax Contingency [Line Items]
Potential tax benefit on reversal of net operating loss carryforwards valuation allowance	1,300,000
Foreign Country [Member] | General Business [Member]
Income Tax Contingency [Line Items]
Tax credit carryforward, amount	$ 13,200,000